2. The member OBC and sheave at C together have a mass of 500 kg, with a combined center of mass at G. Calculate the magnitude of the force supported by the pin connection at O when the 3-kN load is ap- plied. The collar at A can provide support in the hor- izontal direction only. 4.5 m 1.5 m B T 0.5 m im -0.5 m A 30°1 1 3 kN 1 m